DOI: 10.1175/JCLI-D-12-00499.1
Scopus记录号: 2-s2.0-84878970132
论文题名: Remote forcing versus local feedback of east pacific intraseasonal variability during boreal summer
作者: Rydbeck A.V. ; Maloney E.D. ; Xie S.-P. ; Hafner J. ; Shaman J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 11 起始页码: 3575
结束页码: 3596
语种: 英语
Scopus关键词: Atmosphere models
; Community atmosphere model
; Intraseasonal variability
; National center for atmospheric researches
; Phase locking mechanisms
; Rapid communication
; Sensitivity tests
; Tropical intraseasonal variability
; Cams
; Communication
; Gravity waves
; Climate change
; climate feedback
; climate forcing
; Kelvin wave
; Madden-Julian oscillation
; seasonal variation
; sensitivity analysis
; signal processing
; summer
; warm pool
; wave propagation
; wind
; Pacific Ocean
; Pacific Ocean (East)
英文摘要: During boreal summer (June-October), interactions between intraseasonal variability in the Eastern Hemisphere and east Pacific warm pool are often described as a local amplification of theMadden-Julian oscillation (MJO), the dominant mode of tropical intraseasonal variability. The MJO in the Eastern Hemisphere emits eastward-propagating dry Kelvin wavesthat are a source of rapid communication with the east Pacific. However, the precise mechanism by and degree to which intraseasonal variability in the Eastern Hemisphere interacts with the east Pacific are not well understood. To quantify the relationship, sensitivity tests in two separate models are used: the National Center for Atmospheric Research (NCAR) Community Atmosphere Model (CAM) and the International Pacific Research Center Regional Atmosphere Model (IRAM). Different methods are employed to isolate the east Pacific from outside intraseasonal signals in each model. When isolated fromKelvin wave fronts associated with the MJO, the CAM produces similar east Pacific intraseasonal variability to observations. In the CAM, the communication of intraseasonal signals by Kelvin waves does not appear necessary to the initiation and maintenance of east Pacific intraseasonal variability, suggesting that such events can be independent of the MJO. However, communication by MJO-initiated Kelvin waves provides a possible phase locking mechanism between hemispheres. Whenthe east Pacific is isolated from all remote intraseasonal signals in the IRAM, intraseasonal events there are weak and incoherent. In the IRAM communication across the Pacific appears necessary to the representation of east Pacific intraseasonal variability. However, the IRAM contains an important bias in the climatological low-level winds that may suppresseast Pacific intraseasonal events. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51868
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; International Pacific Research Center, University of Hawaii at Manoa, Honolulu, HI, United States; Department of Environmental Health Sciences, Columbia University, New York, NY, United States
Recommended Citation:
Rydbeck A.V.,Maloney E.D.,Xie S.-P.,et al. Remote forcing versus local feedback of east pacific intraseasonal variability during boreal summer[J]. Journal of Climate,2013-01-01,26(11)